Metallic packing for piston-rods and the like.



W. FODEN. METALLIC PACKING FOB. PISTON RODS AND THE LIKE.

' APPLICATION PILB'D APILB, 1910.

998,165, V Patented July 18, 1911.

M m Mam. a4,

COLUMBIA PLANDGWH 9, WASHINGTON, D. C

UNITED STATES PATENT curios.

WILLIAM FODEN; OF LIVERPOOL, ENGLAND.

METALLIC PACKING FOB, PISTON-RODS AND THE LIKE.

To all whom it may concern:

Be it known that I, VILLIAM FonnN, a subject of the King of GreatBritain, and residing in Liverpool, in the county of Lancaster, England,have invented certain new and useful Improvements in Metallic Packingfor Piston-Rods and the Like, of which.

the following is a specification.

This invention has reference to metallic packings for piston rods, valvespindles, pump rods and the like, of that type in which the packing issingle-ended and is pressed against the rod by the action of a springand also by the fluid pressure, and the object is to effect improvementsin design so as to avoid risk of damage in event of the spring breakingand to more effectually prevent leakage around the back of the packingrings. I accordingly arrange the spring in an annular space in which itis practically inclosed and from which the parts could not escape inevent of fracture, the parts being so arranged that while the springpressure and the fluid pressure are transmitted axially to the packing,access of the fluid pressure to the back of the packing is prevented. Ialso make the wearing rings so that they have overlapping portions andinclose them in two sleeves one of which has an end of enlarged diameterwhich overlaps closely the end of the other sleeve.

In the accompanying drawings which show a packing of this type with myimprovements embodied, Figure 1 is an elevation in axial section, Fig. 2is a cross-see tion on the line A, A, of Fig. 1, and Fig. 3 is a view ofone of the wearing rings 6, showing how they are cut.

1 is the rod, 2 is the stuffing box, and 3 is the gland or cover,secured to the stuffing box by the studs 4, the joint being madefluid-tight in the usual manner by the jointing ring 5.

The wearing rings are made in two sets separated by the usual reverselydoubly coned. ring 7. Each set of wearing rings consists of the endrings 6 and the intervening ring 19. The end rings 6 are each coned onone side to conform with the sleeves subsequently mentioned, and theintervening ring 19 is of tee section as shown, the rings 6 beingrecessed so as to overlap the shoulders of the tee.

One set of the wearing rings is housed in the sleeve 8 and the other inthe sleeve Specification of Letters Patent.

Application filed April 9, 1910.

Patented July 18, 1911.

Serial No. 554,522.

9. The sleeves are coned internally at one end to conform with thewearing rings 6, and their outer ends are preferably made portions ofspherical surfaces struck from the center of the piston when at aboutmidstroke. These spherical surfaces are accurately surfaced so that theymake fluid-tight joint against the corresponding surfaces 10 and 11 ofthe gland and spring sleeve respectively, and as the sleeves 8 and 9 aresmaller in diameter than the stuffing box, the arrangement is thus ofthe floating type, accommodating slight lateral movements of the rod.

For a purpose to be subsequently described, the end of the sleeve 9 isenlarged as shownat 12 and arranged to overlap the adjacent end of thesleeve 8, the surfaces being closely and accurately fitted so as to makea substantially fluid-tight joint.

13 is the neck bush which fits closely in the neck of the stufling box,and has a collar 14 and a long spigot 15 which is interposed between therod and the helical compression spring 16. The neck bush is madeslightly clear of the rod so as to permit of the lateralmovementpreviously referred to.

17 is the spring sleeve which fits externally closely in the stuflingbox, and which also fits internally closely over the collar 14 of theneck bush. The spring sleeve is flanged inwardly at one end, one side ofthe flan forming the accurately surfaced spherical joint surface 11previously mentioned, and the other side forming an abutment for thecompression spring 16 which is located in the annular space between thespring sleeve and the spigot 15 of the neck bush.

The wearing rings 6 and 19 are cut as shown at 18 in Fig. 3, the numberof cuts depending upon the size of the rod. The apex of each cut reachesnearly, but not quite, to the inside of the ring, so that the parts arenot actually separated. In assembling the rings, the cuts are of coursearranged so as to break joint as effectually as possible. I

It will be seen that the axial pressure of the spring sleeve 17 forcesthe spherical surfaces 10 and 11 into close fluid-tight contact andalso, by the action of the coned ends of the sleeves 8 and 9 and thedoubly coned ring 7 it presses the wearing rings 6, as they wear, on tothe rod. As the rings 6 both overlap the ring 19 the latter participatesin the inward niovenent oi the ittn'mer. During: the tluid pressurestroke, the action ot the compressed spring 16 on the sleeve 17 is attl'llttlllttl by the fluid pressure, which has access to the inner faceof the l'lange of the sleeve 17, and the tightness relaxed during; thereturn stroke.

in ordinary single ended packings the steam or other tluid has tr .0access into the s ace in the stalling box behind the packing and. isonly prevented from blo vine; out of the box by the joint cmrespondingto it), which is thus exposed to the tall steam pressure. ln myarrangement on the other hand the fittlt'tt 'annot reachthejoint at it)without first passing the joint at ll, or else passing along: betweenthe spring); sleeve 17 and the stullin g box; in order to do so it mustfirst pass between the neck bush and the neck of the stu'lling box orbetween the collar 1t and the inner sur 'ace ot the. spring sleeve, andas all these surfaces lit closely, any steam so passing; would be smallin quantity and much reduced in pressure, arising verylittle teinlencyto l al; at the joint 10. The ar rangement thus possesses the advantages.l a double ended packing with the simplicity ot a single ended parking.

The object ot' the close over appina' ein gagennnt oil the packingsleeves t and S, t

as shown at 12, is to prevent any steam which may leak into the spacebehind the packing skews from entering into either sleeve and thenpassing down to th rod through the cuts in the wearing rings. Should anysteam ltlt k into tl e sleev 11., the ovia'lzpping parts ot the rings 6and 19 will other additional resistance to leakage toward the rod itwill be seen that the spring 1h being practically entirely inclesed inthe annular space between the spigg et and spring);

sleeve 1?. should it be broken, the frag ments will be prevented fromescaping and so damaging the rod or the wearing rings or other parts ofthe arrangement.

Having now litllly' dest ed my invention, I declare t tat what l: cla inand desire to secure by Letters latent is:---

1. .ln conibiinition; a stalling box. a rod pas, no; thei'etlwough, agland jointed 'tluidtightly to the said box, a metallic packing),

inclosed in a pair oi eves, the toremost off which abuts fluid-tightlyagainst the gland, a spring sleeve fitting closely in the shilling box,exposed interna y to the tluid pressure and almttinp, llnidghtly againstthe end oi the rearniost pa in sleeve, a neck bush fitting closely in tto stalling box, and a ctanpression spring llltci'pflitl bel i i lCopies of patent may be obtained for iv tween the neck bush and thespring sleeve; substantially as described.

2. in combination; a stul'lii'ig box, a rod passing t hercthrough, agland jointed 'l'luidtightly to the said box, a metallic packinginclosed in a pair of sleeves the foremost oil which abuts tluid-tightlyagainst the gland, a neck bush fitting closely in the neck of thestalling box and having an external collar and a spigot. encircling therod and projecting toward the packing, a spring seeve tittine' closelyin the stulling box and over the collar of the neck bush, and having anin ternal l'lange the outer side of which abuts thud-tightly against theend ot the rearniost packing sleeve, and a compre sion spring housed inthe annular space between the spring sleeve and the spigot ot' the neckbush: substantially described.

ln combination; a stutiing' box, a, rod no tl'ierethrough, a glandjointed tluidghtl to the said box, a sleeve abutting laid-tightlyagainstthe gland and containing one set of coned packing rings, a secondsleeve containing; another set of coned packing rings and having its endenlarged and overlapping fluid-tightly the end ot the first sleeve, acoiled ring), between the sets of pack inn rings covered by the sleeves,a compression spring in rear of the second sleeve, and means tortransmitting the axial pressure of said spring and of the tluid to thesleeves without permitting access of the tluid behind the sleeves;substantially as described.

-l. ln combination; a stalling box, a rod passing therethrough, a glandjointed liuidtightly to the said box, a sleeve abutting laid-tightlyagainst, the gland and containing a set of packing rings consisting of apair of rings each concd on oneside and shouldered on the other and a.ring of T section interposed and fitting between. them so that theirshoulders overla a second sleeve containing a similar set of packingrings and having its end enlarged and overlapping fluid-tightly the endof the first sleeve, a coned ring between the sets of packing rii k.overed by the sleeves, a compression spring in rear of the secondsleeve, and means for transmitting the axial pressure of said spring andof the fluid to the sleeves without permitting access of the fluidbehind the sleeves; substantially as described.

in testimony Whereoi I have hereunto set my hand in the presence of twosubscribing witnesses.

WILLIAM FODEN. d i tnesses .l. E. LLOYD Banxns, .losnrn E. Hnzs'r.

each, by addressing; the Commissioner of Patents.

